Network Configuration For VoIP Traffic

Although most default firewalls are configured to allow VoIP Traffic without issue. Here are a few universal steps that you can make to ensure high quality VoIP calling within your network.  

Common VoIP symptoms resulting from firewall restrictions

1. Poor quality audio or no audio during phone calls

2. Static during phone calls or intermittent audio drops

3. Unable to retrieve or place calls into park or transfer to other phones

4. Limited number of phones working, some just won't connect for some reason

5. No network connection or IP address

6. BLF Keys not working as expected (The line key for colleagues should change to red during an active phone call) 

7. Inbound calls are not arriving to several phones. 

If you are experiencing a one-off issue with your VoIP telephones. 
We recommend rebooting your network firewall, modem, and phones. Even if your computers are working, firewalls treat voice traffic differently. 

This often resolves issues and will be the first thing our team will request during a troubleshooting phone call. 

Quick Firewall Adjustments

Although we may need to investigate your unique firewall model, here is a list of the most common, universal steps that you can adjust on nearly all firewalls. 

1. Disable 'SIP ALG'

2. Allow traffic inbound and outbound to the below FQDN addresses:

core1.b1communications.ca

core2.b1communications.ca

portal.b1communications.ca

3. Open Ports as below:

Port Protocol Application Description

5060 TCP and UDP SIP Required for SIP signaling.

5061 TCP and UDP SIPS Required for secure SIP signaling.

9002 TCP WebSockets Required for Web Phone Communication.

20000-27999 UDP RTP Required for Audio streams (RTP)

8001 TCP Web Portal Required for Web Portal

28000-28200 TCP and UDP Conference Required for conferencing

4. Request our technical team provide you our internal IP Addresses for whitelisting along with specific firewall instructions. 

If you continue to experience network issues or firewall related restrictions, 

please contact our technical support